Cowl fastener



Patented Sept. 16, 1 952 April 30, 1949, Serial;N o. 90,587y n i'clainrf (o1. 24g-'gzip' The present invention relatersvto rotary'rs'tud i:

fasteners of the type commonly used for connecting airplane cowling sheets together and aims generally to simplify ,and improve existing fasteners of that type. p

The present vapplication is a division of my parent application Serial No. 459,896,V filed September 28, 1942, now Patent No; 2,479,402, issued August 16, 1949.

Illustrative of the invention, reference ismade tothe accompanying drawingsishowing several preferred embodiments thereop'andin which.

Fig 1 is a plant .W O fconegerm 0f fastener...

secured installation as viewed from the female fastener side;`

Fig. 2 is a plan view thereof as viewed from the Vopposite or stud fastener side;

Fig. 3 is a longitudinal sectional View of the rst form of fastener as taken on the line 3 3 of Fig. 1, but showing the stud fully inserted prior to being turned to locked position;

Fig. 4 is asimilar View with the stud in its locked position;` Y

Fig. 5 is a transverse sectional view taken on the line 5.-5 of Fig. 1;

Fig. d is a'horizontal sectional View taken on the line 6.-6 of Fig. 4; and

Fig. 7 is a sectional View similar to Fig. 3 of a slightly modified form of the invention.

The present invention provides new and efcient female fastening members for cooperation with rotary stud fasteners having a pluralityr of sets of radial arms or pins at least one of which is designed to lock against a locking plate of the female fastening member. According to the invention, means are provided for engaging one set of radial stud arms for resiliently holding vthe parts of the installation in flush-tight locked position. In accordance with one embodiment, the invention includes means for automatically partially ejecting the stud from the female fastener member when in unlocked position so that the unlocked condition of the fastener will readily be apparent to a workman or inspector.

Referring more particularly to the form of invention shown in Figs. 1 to 6 inclusive, the improved fastenerY member is shown applied to a.

suitable support I, which maybe one of the cowling sheets of an airplane cowling,- thoughit stricted to such use.

tight relationship, conveniently is apertured,i as

at 3, invwhich is fitteda rotary stud or pin 4 having a head 5 exteriorly of the sheet 2. lConven yienu'y the sheet zfi's aperture 3 and thehead- 5 ofthe stud 4 is bevelled so that Yin locked position the outer face of Athe head will be flush with the outer face of the sheet 2. The head of the stud may be `'slotted or grooved for the reception of a zbladed tool for rotating the stud, as is usual.

In order to fasten the sheets I and 2l securely together, the rotary stud or pin is adapted to,-Y cooperatehand locky with a female fastenermem-v bery attached to the rear face of the supporter sheet 1I, and Apreferably thev female fastener formedV of'an elongatedfstrpof metalhaving aA base portion Srigidly attached to the sheethv I, asL Y .by rivets 9. YThe centralv portion o f the `base is raised or spaced from the sheet I (see Figs. 3 to 7) to provide a pin arm-receiving seat Ill which preferably is a rigid part or deformation. The raised portion of the base is provided with a central stud-receiving aperture II, in registry with the aperture of the sheet I, and said aperture II is preferably formed with radial elongations I2 to admit the passage of radial pin arms 6 and 'I. The seat ID preferably is further formed with stop means I3 spaced a desired distance from the elongations I2, as for example therefrom, and advantageously these stop means are formed by outwardly bending portions cut from the raised portion, and serving to provide an abutment to limit rotation of the stud to a desired angular position.

The female fastener member preferably lncludes an integral spring arm I5 extended from one end of the base and connected thereto by a U-shaped bight portion I6 so as to overlie a portion of the base and the stud When the parts of the fastener are assembled. The portion of the spring arm I5, preferably an endportion thereof, is outwardly inclined and formed with an elongated opening I'I to receive the end of the stud 4 and radial pin arms 1, and this opening I'I is preferably in alignment with the aperture I0 and radial elongations I2 of the raised seat portion IIJ of the base. The end of the spring, on opposite sides of the opening I1, is formed rwith spaced raised portions I8 rand an intermediate pin-receiving seat I9 for the reception of the radial pin arms 'I when the stud is rotated to locked position.y

when the stud 4 is applied to 'the female fas.-V

'tener member and rotated tov locked position, as

shown inFig. 4, the interengaging spring arxnk and studfpin arms I provide Vsupplemental re'-V 'j silient tension for holding 'the parts in assembled locked positionas well as to provide a yeldable countersnnk around thev 3 seat for the supplemental pin arms 'l tending to resist accidental rotation or unlocking of the stud, such as may be caused by vibration of the parts I and 2.

It will beiunderstood that thebaseiportionva.. v5 of the femaler-fastenerimay be attached. to the support l in any suitable manner, and when it is desirable to rivet the base to the support in if tening member comprising a metal strip having regions underlying an overlying spring arm, f. the... t. an apertured base attached to said support with spring arm may be apertured as at I9a forl'thelo `th'e"'aperture thereof in alignment with the suppassage of the rivet and rivetingtool. portaperturaaportion of said base being spaced According to one feature ofthelinventioniitff from theladjacent-vfa'ce of the support providing is desirable to provide means for automaticallyff an'outwardlyspaced' seat for cooperative engage- Daltially electing the stud when. in unloeked-posi-- ment .withlone pair-01E` radial arms, and a spring tion, so that the condition of the fastenerwill i5 member integrally lconnected to one end of said be readily apparent t0 the WOIkIllaIITOIinspector` base and foldedbackcthereover and formed with merely by observation.. This may be accom-scf plished by providing a spring arm extension 2l)v connected to and extending from the -baseafidi'` overlying the stud-receiving apertures outwardly Y20 of the basefa's shown-'in Figj. thestud* 4 is inlocked positionv7 in thefastener 'as shown'iif anapertured. .pini-'receiving seat portion for receiving and. engaging another set of radial arms of saidpi'for supplying supplemental resilient pressure for holding said pin. in said female fastener-element;

' LEONARD ATPOWELTS i When 1the ''studv is1 ein 'unlocked 2 position With'the Y REFERTE'NCESTGITE pinv -armsf6 and lalignedwith the -elon'gations 425 of the openingsfl `land' H respectively; theisprin'gf-1-f 20 forces the stud inwardlyfpartially jecting thief* f studfs'o 'thatf-thehe'a'dl -i's forced entf-'of theile''f thispaterlt:

UNITED :STATESPATENTS Date The following references are? 'of rcord. in the wish to beflimited therebyl because* the yscopeff of 'myinvention is best-deflndby the following 35 ia claim:y l* v Y 

